nuttx/libs/libc/modlib/modlib_loadshdrs.c

/****************************************************************************
 * libs/libc/modlib/modlib_loadshdrs.c
 *
 *   Copyright (C) 2015, 2017 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <assert.h>
#include <errno.h>
#include <debug.h>

#include <nuttx/lib/modlib.h>

#include "libc.h"
#include "modlib/modlib.h"

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: modlib_loadshdrs
 *
 * Description:
 *   Loads section headers into memory.
 *
 * Returned Value:
 *   0 (OK) is returned on success and a negated errno is returned on
 *   failure.
 *
 ****************************************************************************/

int modlib_loadshdrs(FAR struct mod_loadinfo_s *loadinfo)
{
  size_t shdrsize;
  int ret;

  DEBUGASSERT(loadinfo->shdr == NULL);

  /* Verify that there are sections */

  if (loadinfo->ehdr.e_shnum < 1)
    {
      berr("ERROR: No sections(?)\n");
      return -EINVAL;
    }

  /* Get the total size of the section header table */

  shdrsize = (size_t)loadinfo->ehdr.e_shentsize *
             (size_t)loadinfo->ehdr.e_shnum;
  if (loadinfo->ehdr.e_shoff + shdrsize > loadinfo->filelen)
    {
      berr("ERROR: Insufficent space in file for section header table\n");
      return -ESPIPE;
    }

  /* Allocate memory to hold a working copy of the sector header table */

  loadinfo->shdr = (FAR FAR Elf_Shdr *)lib_malloc(shdrsize);
  if (!loadinfo->shdr)
    {
      berr("ERROR: Failed to allocate the section header table. Size: %ld\n",
           (long)shdrsize);
      return -ENOMEM;
    }

  /* Read the section header table into memory */

  ret = modlib_read(loadinfo, (FAR uint8_t *)loadinfo->shdr, shdrsize,
                    loadinfo->ehdr.e_shoff);
  if (ret < 0)
    {
      berr("ERROR: Failed to read section header table: %d\n", ret);
    }

  return ret;
}